تقرير
Ensemble spin relaxation of shallow donor qubits in ZnO
| العنوان: | Ensemble spin relaxation of shallow donor qubits in ZnO |
|---|---|
| المؤلفون: | Niaouris, Vasileios, Durnev, Mikhail V., Linpeng, Xiayu, Viitaniemi, Maria L. K., Zimmermann, Christian, Vishnuradhan, Aswin, Kozuka, Y., Kawasaki, M., Fu, Kai-Mei C. |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Quantum Physics, Condensed Matter - Materials Science |
| الوصف: | We present an experimental and theoretical study of the longitudinal electron spin relaxation ($T_1$) of shallow donors in the direct band-gap semiconductor ZnO. $T_1$ is measured via resonant excitation of the Ga donor-bound exciton. $T_1$ exhibits an inverse-power dependence on magnetic field $T_1\propto B^{-n}$, with $4\leq n\leq 5$, over a field range of 1.75 T to 7 T. We derive an analytic expression for the donor spin-relaxation rate due to spin-orbit (admixture mechanism) and electron-phonon (piezoelectric) coupling for the wurtzite crystal symmetry. Excellent quantitative agreement is found between experiment and theory suggesting the admixture spin-orbit mechanism is the dominant contribution to $T_1$ in the measured magnetic field range. Temperature and excitation-energy dependent measurements indicate a donor density dependent interaction may contribute to small deviations between experiment and theory. The longest $T_1$ measured is 480 ms at 1.75 T with increasing $T_1$ at smaller fields theoretically expected. This work highlights the extremely long longitudinal spin-relaxation time for ZnO donors due to their small spin-orbit coupling. Comment: 9 pages, 11 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.105.195202 |
| URL الوصول: | http://arxiv.org/abs/2111.11564 |
| رقم الأكسشن: | edsarx.2111.11564 |
| قاعدة البيانات: | arXiv |
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